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오경근,김승욱,홍석인 ( Kyung Keun Oh,Seung Wook Kim,Suk In Hong ) 한국화학공학회 1992 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.30 No.4
The immobilization of cellulase was studied to stabilize the enzyme and thus increase the efficiency of the hydrolysis of cellulose. The cellulase induced from the fungus Trichoderma reesei QM 9414, was immobilized on Ca-alginate bead. The experiments were performed in order to find the optimum conditions for immobilization and understand the properties of immobilized enzyme systems. Experimental results showed that optimal concentrations of Na-alginate and CaCl₂ providing the highest activity of immobilized enzyme systems, were 3%(w/v) and 0.4 M, respectively. The gel strength of the immobilized bead was increased in proportion to the concentration of Na-alginate but independent of the concentration of CaCl₂. The activity of the immobilized enzyme system was enhanced three folds compared to free enzyme system. Also, the productivities of reducing sugar and glucose were increased three folds by the addition of immobilized β-glucosidase in comparison with free β-glucosidase system.
농업부산물 고추대 (Pepper Stem)을 이용한 묽은 황산 자일로즈 분별공정의 최적화
원경연(Kyung-Yoen Won),오경근(Kyeong-Keun Oh) 한국생물공학회 2009 KSBB Journal Vol.24 No.4
본 연구에서는 반응표면분석법 (RSM)을 따른 고추 대의 묽은 황산을 이용한 자일로즈 분별 공정을 통해 고추대 시료로부터 최적의 자일로즈 수율을 얻을 수 있는 반응 조건을 예측할 수 있었다. 실제 실험 결과 최적 반응은 온도 147℃, 산 농도 2.8% H2SO4, 반응시간 21 min. 임을 알 수 있었고 최적 조건에서의 실험결과는 예측 값 78% 보다 약 7% 낮은 71% 자일로즈 수율을 얻을 수 있었다. SEM 과 XRD분석을 통해 전처리 전후의 시료의 이미지 분석을 하여 산 전처리 공정을 통해 섬유소 기질 외 다른 성분인 반 섬유소가 분해 되어 추출액상으로 자일로즈로 용해 되었음을 가시적으로 확인 할 수 있었고 전처리 된 고추대의 결정화 도가 전처리 전보다 증가했음을 확인 할 수 있었다. 이로써 비결정성 물질인 반섬유소와 기타 성분들이 묽은 황산을 이용한 자일로즈 분별공정에 의해 분리 되었음을 확인하였다. Response surface methodology (RSM) was used for optimization the fraction conditions of xylose from pepper stem with dilute sulfuric acid. The independent variables were acid concentration in the range of 1.134 to 2.866%, reaction temperatures in the range of 142.68 to 177.32℃, and hydrolysis time in the range of 6.34 to 23.66 min. were studied. The dependent variables were xylose yield from pepper stem, and the production of by-products, for example, furfural, acetic aicd, HMF etc. Experimental results had a good match with statistical result. The maximum xylose yield obtained in this experiment was 71% concentration.
원경연(Won, Kyung-Yoen),정태수(Jeong, Tae-Su),최원일(Choi, Won-Il),오경근(Oh, Kyeong-Keun) 한국신재생에너지학회 2009 한국신재생에너지학회 학술대회논문집 Vol.2009 No.11
Lignocellulosic biomass is the most abundant organic material on earth and also promising raw material for bioenergy production. Agricultural residues in the process of bio-oil extraction, is an abundant and low-cost lignocellulosic material. The technology for conversion of lignocellulosic biomass resources to fuels and chemicals, such as ethanol, has been under development for decades. One of the well-studied technologies that are currently being commercialized is to use a dilute acid-catalyzed pretreatment followed by enzymatic hydrolysis and fermentation to produce ethanol. In this work, the dilute-acid hydrolysis of agricultural residues was optimized through the utilization of statistical experimental design. Evaluation criteria for optimization of the pretreatment conditions were based on high xylose recovery and low inhibitor contents in the hydrolyzates. The purpose of this study was to gain a more accurate understanding of the quantities of acid required for effective hydrolysis and the reactivity trade-offs with reaction time and temperature that will enable overall process optimization.
바이오에탄올 생산을 위한 농산부산물(유채짚)의 묽은 산 전처리 공정 최적화
정태수(Jeong, Tae-Su),원경연(Won, Kyung-Yoen),오경근(Oh, Kyeong-Keun) 한국신재생에너지학회 2008 한국신재생에너지학회 학술대회논문집 Vol.2008 No.10
Biological conversion of biomass into fuels and chemicals requires hydrolysis of the polysaccharide fraction into monomeric sugars. Hydrolysis can be performed enzymatically, and with dilute or concentrate mineral acids. In this study, dilute sulfuric acid used as a catalyst for the hydrolysis of rapeseed straw. The purpose of this study is to optimize the hydrolysis process in a 15ml bomb tube reactor and investigate the effects of the acid concentration, temperature and reaction time on the hemicellulose removal and consequently on the production of sugars (xylose, glucose and arabinose) as well as on the formation of by-products (furfural, 5-hydroxymethylfurfural and acetic acid). Statistical analysis was based on a model composition corresponding to a 3³ orthogonal factorial design and employed the response surface methodology (RSM) to optimize the hydrolysis conditions, aiming to attain maximum xylose extraction from hemicellulose of rapeseed straw. The obtained optimum conditions were: acid concentration of 0.77%, temperature of 164?C with a reaction time of 18min. Under these conditions, 75.94% of the total xylose was removed and the hydrolysate contained 0.65g L^{-1} Glucose, 0.36g L^{-1} Arabinose, 3.59g L^{-1} Xylose, 0.51g L^{-1} Furfural, 1.36g L^{-1} Acetic acid, and 0.08g L^{-1} 5-hydroxymethylfurfural.